>>> on this sunday night, twit of fate. a decorated former navy s.e.a.l. the yuz military's most lethal sniper, is shot and killed in texas. tonight, the remarkable life of chris kyle and what we know about the suspect. >>> fight over guns as the president makes his case for proper gun laws. the head of the nra again rejects universal background checks but the fallout over this white house photo of the president. >>> painful lesson as college loan debt soars, a record number of grat ritts are having trouble making payments foent, the crushing burden after earning that degree. >>> and diet myths. in the never-ending battle to lose weight is there anything that really works? yet another study trying to separate fact from fiction. >>> good evening. we begin tonight with a tragic irony that is befallen an american hero. a former navy s.e.a.l. who surviveed four combat tours in iraq and along the way became the most lethal sniper in american military history has been murdered in texas. authorities in lancaster, texas, have charged another former iraq war veteran with killing chris kyl

weapons. >>> a lot of americans have read the book called "american sniper," written by former navy s.e.a.l. chris kyle, often referred to as america's best and deadliest sniper during his war-time deployments overseas. chris kyle was killed this weekend in texas after he and a friend took a troubled fellow marine veteran for an outing at a shooting range. we get the story tonight from nbc's jim miklaszewski. >> reporter: as a navy s.e.a.l. sniper in iraq, chris kyle was so feared, the enemy called him the devil of ramadi and put an $80,000 on his head. >> it gave me pride knowing i put fear in the mind of the terrorists and made them fearful of me. >> tragically, it was back home where kyle and a friend were shot and killed. the suspect is a 25-year-old marine reservist, eddie ray routh. without warning, routh allegedly shot the two victims with a semiautomatic handgun. he's in custody facing two charges of capital murder. sheriff tommy bryant told reporters, routh turned on his guards overnight. >> he became aggressive, and they believed he was about to assault them so they tased hi

of people i saved, that's something i would brag about. >> reporter: after leaving the navy in 2009, he started a security company in his native texas. it was on a shooting range 50 miles out of fort worth that kyle and chad littlefield were shot to death. a former marine arrived with them and killed them with a semiautomatic handgun recovered at his sister's house and confessed to the murder before returning home. >> around 9:00 p.m. they spiked his tires. the vehicle was stopped, and he was apprehended without any scuffle or fight. >> reporter: the sheriff says his understanding is that ralph may suffer from mental problems related to his military service but offered no specifics or possible motive. much of kyle's time in iraq was spent providing sniper cover for u.s. troops in some of the war's most intense urban battles. >> every person i killed i have a clear conscience of, because they were actively trying to harm americans, allies or civilians. >> reporter: his skills earned him a reputation with insurgents. >> they put a bounty on your head. >> reporter: they did. you make it th

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